a primer on dynamic sealing
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a primer on dynamic sealing. or, how to keep water from messing up all your cool moving contraptions. STATIC. DYNAMIC. DYNAMIC. O-ring (static seal). Specifications and help from Parker O-ring Handbook Male gland seals usually preferable Easier to machine external groove

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a primer on dynamic sealing

a primer on dynamic sealing

or, how to keep water from messing up all your cool moving contraptions

M J Stanway

slide2

STATIC

DYNAMIC

DYNAMIC

dynamic sealing

o ring static seal
O-ring (static seal)
  • Specifications and help from Parker O-ring Handbook
  • Male gland seals usually preferable
    • Easier to machine external groove
    • Less likely to damage seal during assembly
  • BUT prone to failure in rotating applications

dynamic sealing

flexiseal
FlexiSeal
  • Specifications and help from Parker Flexi-Seal Handbook
  • “C” shaped open o-ring with enclosed spring
  • Used by SeaGrant in thrusters and other reciprocating seals
  • Sold as “Spring-loaded PTFE seals” in McMaster (pg. 3244)

dynamic sealing

flexiseal installation
FlexiSeal installation
  • “heel first” 2-part gland seal advisable
    • Open end of seal faces higher pressure
    • Easy to machine
    • Easy to assemble without damaging seal
  • Other options include step-cut glands with/without snap ring retainer

dynamic sealing

magnetic coupling
Magnetic Coupling
  • Good for thrusters, not high enough accuracy for positioning actuators
  • Simple concept, potentially difficult design
  • COMPLETELY separated from fluid by casing material

dynamic sealing

magnetic coupling7
Magnetic Coupling
  • 2-3 manufacturers make something currently that MIGHT work
  • WHOI uses them for thrusters on something
  • Might be able to design and fabricate our own at low cost

dynamic sealing

mc design considerations
MC Design Considerations
  • Use neodymium for high strength to volume ratio
  • Possible source: K&J Magnetics - $7.50 for 100 (1/4 x 1/8 x 1/16)
  • Even number of magnets, same on inner and outer rotor
  • Alternate poles around rotors

dynamic sealing

mc design considerations9
MC Design Considerations
  • Rotor that sits inside in coupling would be wet side
    • allows for thin wall thickness in endcap between magnets (that part is in tension)
    • possible quick-disconnect props
  • Endcap most likely Aluminum

dynamic sealing

other waterproofing
Other waterproofing
  • Potting
    • Solid material
    • Insulates
    • Reduction in power
    • Good for sensors, not actuators
  • Oil pressure compensation
    • Can have power loss
    • System can be bulky & expensive

dynamic sealing

seals in our rov
Seals in our ROV

questions?

NOTE: pictures taken from Parker, Magnetic Technologies Ltd, Magnetic Materials and Components, and Bluefin Robotics

dynamic sealing

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